We evaluate the performance of VRLS trained on the simple environment E0, over realistic environments accommodating various mobility, density, wireless channel conditions, and message traffic in the DOCA. To simulate the vehicular network in the evaluation environments, we use a full-stack LTE V2V protocol in ns-3 [1]}, based on our own implementation that extends the openly available D2D [2]} and LTE [3]} modules. The V2V channel model consists of a realistic path loss and shadow fading according to the 3GPP evaluation methodology [4]} (cf. Table REF  for details). Further, we simulate the vehicular mobility in the evaluation environments using the realistic traffic simulator SUMO [5]}. Mobility traces from the simulated scenarios we describe below are first generated using SUMO; then, the traces are input to ns-3 to simulate the location of the vehicular nodes. In SUMO, new vehicles are created at different times, which continuously enter and leave the DOCA during the simulated time. In ns-3, however, all nodes need to be created at the beginning of a simulation. Therefore, we turn off the radio functionality of any node outside the DOCA during the network simulations in ns-3.
